NL189426C - METHOD FOR DETERMINING THE COLOR OF A TABLE CUT GEMSTONE. - Google Patents
METHOD FOR DETERMINING THE COLOR OF A TABLE CUT GEMSTONE.Info
- Publication number
- NL189426C NL189426C NLAANVRAGE7907348,A NL7907348A NL189426C NL 189426 C NL189426 C NL 189426C NL 7907348 A NL7907348 A NL 7907348A NL 189426 C NL189426 C NL 189426C
- Authority
- NL
- Netherlands
- Prior art keywords
- color
- determining
- cut gemstone
- table cut
- gemstone
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/87—Investigating jewels
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Spectrometry And Color Measurement (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7839847 | 1978-10-09 | ||
GB7839847 | 1978-10-09 |
Publications (3)
Publication Number | Publication Date |
---|---|
NL7907348A NL7907348A (en) | 1980-04-11 |
NL189426B NL189426B (en) | 1992-11-02 |
NL189426C true NL189426C (en) | 1993-04-01 |
Family
ID=10500211
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NLAANVRAGE7907348,A NL189426C (en) | 1978-10-09 | 1979-10-03 | METHOD FOR DETERMINING THE COLOR OF A TABLE CUT GEMSTONE. |
Country Status (9)
Country | Link |
---|---|
JP (1) | JPS5598341A (en) |
AU (1) | AU527834B2 (en) |
BE (1) | BE879290A (en) |
CH (1) | CH644452A5 (en) |
DE (1) | DE2940625A1 (en) |
FR (1) | FR2438837A1 (en) |
IL (1) | IL58344A (en) |
NL (1) | NL189426C (en) |
ZA (1) | ZA795228B (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ZA813263B (en) * | 1980-06-04 | 1982-06-30 | De Beers Cons Mines Ltd | The assessment of colour in diamonds and other gems |
JPS58728A (en) * | 1981-06-25 | 1983-01-05 | Shimadzu Corp | Diamond color measuring device |
JPS5830644A (en) * | 1981-08-14 | 1983-02-23 | Ii R C:Kk | Method for deciding optical axis |
JPH0711488B2 (en) * | 1992-12-18 | 1995-02-08 | 株式会社泰光 | A jewel magnifying device with a cut surface |
FR2768513B1 (en) * | 1997-09-15 | 1999-12-03 | Jean Pierre Delgrande | COMPARATIVE COLORIMETRIC ANALYSIS METHOD AND CORRESPONDING DEVICE |
CA3087312C (en) * | 2017-12-29 | 2022-02-15 | Goldway Technology Limited | Diamond clarity measurement process and system |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2992588A (en) * | 1958-02-03 | 1961-07-18 | Beckman Instruments Inc | Photometer reflectance unit |
DE1772105C2 (en) * | 1968-03-30 | 1974-04-04 | Eickhorst, Manfred, 2000 Hamburg | Device for determining the photometric transmission of cut diamonds |
BE789234A (en) * | 1971-09-29 | 1973-01-15 | Colorant Schmuckstein G M B H | METHOD AND DEVICE FOR REGISTRATION OF THE QUALITIES OF JEWELERY STONES |
AT344419B (en) * | 1973-03-20 | 1978-07-25 | Dihaco Diamanten Handels Co | DEVICE FOR DETERMINING THE EVALUATION DATA OF COLORED GEMS, IN PARTICULAR DIAMONDS |
ZA765149B (en) * | 1976-08-27 | 1978-04-26 | De Beers Ind Diamond | Measurement of optical properties |
JPS5378855A (en) * | 1976-12-21 | 1978-07-12 | Nec Corp | Polygonal jewery identifying device |
-
1979
- 1979-09-27 IL IL58344A patent/IL58344A/en unknown
- 1979-10-02 ZA ZA00795228A patent/ZA795228B/en unknown
- 1979-10-03 NL NLAANVRAGE7907348,A patent/NL189426C/en not_active IP Right Cessation
- 1979-10-05 AU AU51505/79A patent/AU527834B2/en not_active Ceased
- 1979-10-06 DE DE19792940625 patent/DE2940625A1/en not_active Withdrawn
- 1979-10-08 FR FR7924974A patent/FR2438837A1/en active Granted
- 1979-10-09 BE BE0/197549A patent/BE879290A/en not_active IP Right Cessation
- 1979-10-09 CH CH907379A patent/CH644452A5/en not_active IP Right Cessation
- 1979-10-09 JP JP12957079A patent/JPS5598341A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
AU5150579A (en) | 1980-04-17 |
CH644452A5 (en) | 1984-07-31 |
FR2438837A1 (en) | 1980-05-09 |
AU527834B2 (en) | 1983-03-24 |
BE879290A (en) | 1980-04-09 |
ZA795228B (en) | 1980-09-24 |
FR2438837B1 (en) | 1983-02-25 |
IL58344A (en) | 1983-09-30 |
NL189426B (en) | 1992-11-02 |
JPS5598341A (en) | 1980-07-26 |
DE2940625A1 (en) | 1980-06-04 |
NL7907348A (en) | 1980-04-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A85 | Still pending on 85-01-01 | ||
BA | A request for search or an international-type search has been filed | ||
BB | A search report has been drawn up | ||
BC | A request for examination has been filed | ||
V1 | Lapsed because of non-payment of the annual fee |
Effective date: 19980501 |